Here is an image from a recent wedding that I shot in JPEG. There is nothing I could have gained from shooting this RAW and I consider it a very important client image that needs to have the highest IQ possible.
Yes that's a very nice image. No question. But keep shooting JPEG only and the day WILL come when you kick yourself hard for not shooting RAW. Why do you think photographers with the deepest experience shoot RAW? It's not to be cool. It's professional. RAW gives you a lot more headroom and that will either save the day for you in a big way or just mean better images for your client.
I remember once not getting a job I quoted on because I was too young. It was nothing to do with my portfolio or bad breath. The client said they only hire photographers aged 45 or over. Why? They never stuff up. Now that is a very narrow viewpoint, but there is something in it isn't there? Evolved professionalism has many subtle dimensions. Shoot RAW.
I know there have been a few times I wished the image was RAW but those times have become fewer and further between. One day it may come back to hurt me we will see. There are, however, very experienced professional wedding photographers that shoot only JPEG. Mike Colon is one of them and he shoots three million dollar celebrity weddings. He charges over $20,000 for a wedding and he feels comfortable enough to shoot JPEG throughout the wedding. I think it just comes down to a preference and style.